In photos: The many bridges of Pittsburgh

The Smithfield Street Bridge (in foreground) and the Panhandle Bridge span the Monongahela River, connecting the South Side with Downtown Pittsburgh.

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The Panhandle Bridge (officially the Monongahela River Bridge) carries Port Authority trolleys across the river.

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The Liberty Bridge carries traffic over the Mon River. It connects Downtown Pittsburgh and the Liberty Tunnel, which stretches through Mount Washington to the South Hills. It also connects to McArdle Roadway, where vehicles can drive up Mount Washington for a scenic city view.

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The South Tenth Street Bridge (Philip Murray Bridge) connects the Armstrong Tunnel and Second Avenue with the South Side Flats.

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The Birmingham Bridge carries traffic to and from Uptown Pittsburgh, Oakland and the South Side Flats.

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The Hot Metal Bridge over the Mon River connects the South Side with Second Avenue.

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The Homestead Grays Bridge, named for the former Negro League baseball team, spans the Mon River between Homestead (Allegheny County) and Squirrel Hill (City of Pittsburgh).

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The Fort Duquesne Bridge

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The Roberto Clemente Bridge (formerly Sixth Street Bridge) connects Downtown Pittsburgh with the North Shore. During Pirates baseball games at PNC Park and Steelers football games at Heinz Field, the bridge over the Allegheny River is restricted to pedestrian use only.

PHOTO: Marcie Cipriani

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The Andy Warhol Bridge (a.k.a. the Seventh Street Bridge) also spans the Allegheny River between Downtown and the North Side.

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The Rachel Carson Bridge (formerly the Ninth Street Bridge) is the third of the so-called "sister bridges" spanning the Allegheny between Downtown and the North Side.

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The David McCullough Bridge (formerly the 16th Street Bridge) carries traffic over the Allegheny River, connecting Penn Avenue in the Strip District with Chestnut Street on the North Side.

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The 31st Street Bridge carries traffic over the Allegheny River, connecting the Troy Hill and Strip District neighborhoods.

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The McKees Rocks Bridge spans the Ohio River, connecting Route 65 in the Brighton Heights area of Pittsburgh with Route 51 in the borough of McKees Rocks.

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The West End Bridge over the Ohio River connects Pittsburgh's West End and North Side.

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The Hulton Bridge spans the Allegheny River, connecting the eastern suburbs of Oakmont and Harmar Township.

The Smithfield Street Bridge (in foreground) and the Panhandle Bridge span the Monongahela River, connecting the South Side with Downtown Pittsburgh.

The Panhandle Bridge (officially the Monongahela River Bridge) carries Port Authority trolleys across the river.

The Liberty Bridge carries traffic over the Mon River. It connects Downtown Pittsburgh and the Liberty Tunnel, which stretches through Mount Washington to the South Hills. It also connects to McArdle Roadway, where vehicles can drive up Mount Washington for a scenic city view.

The South Tenth Street Bridge (Philip Murray Bridge) connects the Armstrong Tunnel and Second Avenue with the South Side Flats.

The Birmingham Bridge carries traffic to and from Uptown Pittsburgh, Oakland and the South Side Flats.

The Hot Metal Bridge over the Mon River connects the South Side with Second Avenue.

The Homestead Grays Bridge, named for the former Negro League baseball team, spans the Mon River between Homestead (Allegheny County) and Squirrel Hill (City of Pittsburgh).

The Fort Duquesne Bridge

The Roberto Clemente Bridge (formerly Sixth Street Bridge) connects Downtown Pittsburgh with the North Shore. During Pirates baseball games at PNC Park and Steelers football games at Heinz Field, the bridge over the Allegheny River is restricted to pedestrian use only.

PHOTO: Marcie Cipriani

The Andy Warhol Bridge (a.k.a. the Seventh Street Bridge) also spans the Allegheny River between Downtown and the North Side.

The Rachel Carson Bridge (formerly the Ninth Street Bridge) is the third of the so-called "sister bridges" spanning the Allegheny between Downtown and the North Side.

The David McCullough Bridge (formerly the 16th Street Bridge) carries traffic over the Allegheny River, connecting Penn Avenue in the Strip District with Chestnut Street on the North Side.

The 31st Street Bridge carries traffic over the Allegheny River, connecting the Troy Hill and Strip District neighborhoods.

The McKees Rocks Bridge spans the Ohio River, connecting Route 65 in the Brighton Heights area of Pittsburgh with Route 51 in the borough of McKees Rocks.

The West End Bridge over the Ohio River connects Pittsburgh's West End and North Side.

The Hulton Bridge spans the Allegheny River, connecting the eastern suburbs of Oakmont and Harmar Township.

The Smithfield Street Bridge (in foreground) and the Panhandle Bridge span the Monongahela River, connecting the South Side with Downtown Pittsburgh.

The Panhandle Bridge (officially the Monongahela River Bridge) carries Port Authority trolleys across the river.

The Liberty Bridge carries traffic over the Mon River. It connects Downtown Pittsburgh and the Liberty Tunnel, which stretches through Mount Washington to the South Hills. It also connects to McArdle Roadway, where vehicles can drive up Mount Washington for a scenic city view.

The South Tenth Street Bridge (Philip Murray Bridge) connects the Armstrong Tunnel and Second Avenue with the South Side Flats.

The Birmingham Bridge carries traffic to and from Uptown Pittsburgh, Oakland and the South Side Flats.

The Hot Metal Bridge over the Mon River connects the South Side with Second Avenue.

The Homestead Grays Bridge, named for the former Negro League baseball team, spans the Mon River between Homestead (Allegheny County) and Squirrel Hill (City of Pittsburgh).

The Fort Duquesne Bridge

The Roberto Clemente Bridge (formerly Sixth Street Bridge) connects Downtown Pittsburgh with the North Shore. During Pirates baseball games at PNC Park and Steelers football games at Heinz Field, the bridge over the Allegheny River is restricted to pedestrian use only.

PHOTO: Marcie Cipriani

The Andy Warhol Bridge (a.k.a. the Seventh Street Bridge) also spans the Allegheny River between Downtown and the North Side.

The Rachel Carson Bridge (formerly the Ninth Street Bridge) is the third of the so-called "sister bridges" spanning the Allegheny between Downtown and the North Side.

The David McCullough Bridge (formerly the 16th Street Bridge) carries traffic over the Allegheny River, connecting Penn Avenue in the Strip District with Chestnut Street on the North Side.

The 31st Street Bridge carries traffic over the Allegheny River, connecting the Troy Hill and Strip District neighborhoods.

The McKees Rocks Bridge spans the Ohio River, connecting Route 65 in the Brighton Heights area of Pittsburgh with Route 51 in the borough of McKees Rocks.

The West End Bridge over the Ohio River connects Pittsburgh's West End and North Side.

The Hulton Bridge spans the Allegheny River, connecting the eastern suburbs of Oakmont and Harmar Township.